Maya and Theo answer a call at a Halloween carnival; but when fire hits the corn maze, the dangers quickly escalate and Maya risks her own life to prove her worth to her increasingly hostile captain. Meanwhile, Station 19 hosts the neighborhood kids for trick-or-treating; a prank war breaks out in the house, and Jack is haunted by a ghost from his past.

The Station 19 crew works against the clock to rescue a group of employees trapped inside of a malfunctioning battery recycling plant. Carina plans a special surprise in an attempt to reconnect with Maya; Travis gets caught in the crosshairs of dirty politics, and Jack turns up at clinic day only to be confronted with new details about his past.

When a lightning storm crashes a helicopter, the team is drawn away from hosting a fire boot camp for young women, and Natasha calls on Jack to help Vic run the camp instead. As the storm brews outside, things get even more heated inside between Carina and Maya on the fall finale of Station 19.

Dixon threatens Natasha in the aftermath of his poor judgement. Meanwhile, Jack is met with disappointment on his first day back. Diane visits Maya, and the team responds to a fire in Theo's old neighborhood.

Theo realizes there is an uptick of fires in his old neighborhood and finds himself returning. At the clinic, Sullivan greets a patient with a large chest burn. Carina treats a pregnant patient who presents her with an offer.

A simulation fire training goes dangerously wrong. Maya tries to make amends, and Bailey encourages Carina to listen. Meanwhile, Jack’s sister shows up at the station with a friend, an injury and an attitude.

A call from a social media star’s livestream sends the team on an unusual rescue. Travis’ mayoral campaign takes off, much to his chagrin. Back at the station, Ben treats a patient with a surprising diagnosis.

The crew finds themselves in the middle of a family dispute and a renovation that’s gone off the rails. Ben crashes as Bailey and Carina go undercover at a crisis pregnancy center. Travis preps with Eli for a mayoral town hall.

Emotions boil over at the station as the team chafes against Theo’s leadership style. Carina enlists Ben and Maya to help her with a patient in an uncomfortable position. Natasha and Sullivan’s relationship hits a roadblock.

It’s election day at Station 19, with all eyes on the mayoral race. Andy, Theo and Sullivan vie to be named captain, and Vic forges an unexpected bond after going rogue.

The Station 19 crew trade in their turnouts for tuxes and gowns as they attend the Firefighters Ball, but when disaster strikes, they jump into action to save the day.

Andy steps into the station’s captaincy as Jack's life hangs in the balance. The team is called to a hostage situation. Natasha fights for her career, and Maya and Carina make a choice.

Ben and Theo respond to a challenging Crisis One call, and Jack struggles adjusting to his new reality. Maya and Carina treat a nanny with a surprising diagnosis. Travis finds a surprise at Dixon's wake, and Vic joins Beckett at a family funeral.

The Station 19 crew struts their stuff at the FABruary Winter Pride parade, where Maya encounters someone important from her past. Carina looks to Bailey for support, while Travis and Eli arrive at a crossroads.